Saeb Amini's DDD Brisbane 2019 talk on common async/await misconceptions

1. Common `async` misconceptions
Saeb Amini
Senior Software Consultant @ Readify Telstra Purple
Blog: saebamini.com
@SaebAmini

2. @SaebAmini
.NET 1.1 (APM)

3. @SaebAmini
.NET 2.0 (EAP)

4. @SaebAmini
.NET 4.5 (TAP)

5. @SaebAmini
async == Multithreading
https://blogs.msdn.microsoft.com/ericlippert/2010/11/11/asynchrony-in-c-5-part-six-whither-async/
https://blog.stephencleary.com/2013/11/there-is-no-thread.html
https://weblogs.asp.net/dixin/understanding-c-sharp-async-await-1-compilation

6. @SaebAmini
async == Multithreading
https://blogs.msdn.microsoft.com/ericlippert/2010/11/11/asynchrony-in-c-5-part-six-whither-async/
https://blog.stephencleary.com/2013/11/there-is-no-thread.html
https://weblogs.asp.net/dixin/understanding-c-sharp-async-await-1-compilation

7. @SaebAmini
async == Multithreading
https://blogs.msdn.microsoft.com/ericlippert/2010/11/11/asynchrony-in-c-5-part-six-whither-async/
https://blog.stephencleary.com/2013/11/there-is-no-thread.html
https://weblogs.asp.net/dixin/understanding-c-sharp-async-await-1-compilation

8. @SaebAminihttp://www.ducons.com/blog/tests-and-thoughts-on-asynchronous-io-vs-multithreading

9. @SaebAmini
Can’t have concurrency with purely async code
https://docs.microsoft.com/en-us/windows/win32/fileio/i-o-completion-ports

10. @SaebAmini
Can’t have concurrency with purely async code
https://docs.microsoft.com/en-us/windows/win32/fileio/i-o-completion-ports

11. @SaebAmini
You need to use async/await in the whole call stack

12. @SaebAmini
You need to use async/await in the whole call stack

13. @SaebAmini
Summary
• Async doesn’t need multi-threading
• You can still have concurrency without threads via IOCP
• Async is great, but use it where it makes sense
• You don’t always need async/await and its state machines

14. @SaebAmini
Want to go deeper into the rabbit hole?
• https://blog.stephencleary.com/
• The Zen of async Best practices for best performance https://youtu.be/zjLWWz2YnyQ
• Stephen Toub’s blog: https://devblogs.microsoft.com/pfxteam/
• https://saebamini.com/common-async-and-await-misconceptions/
• https://docs.microsoft.com/en-us/windows/win32/fileio/i-o-completion-ports
• https://blogs.msdn.microsoft.com/ericlippert/2010/11/11/asynchrony-in-c-5-part-six-
whither-async/
• https://weblogs.asp.net/dixin/understanding-c-sharp-async-await-1-compilation

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